eagle.storage.hbase.query.coprocessor.AggregateResult.java Source code

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Here is the source code for eagle.storage.hbase.query.coprocessor.AggregateResult.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package eagle.storage.hbase.query.coprocessor;

import eagle.query.aggregate.raw.GroupbyKey;
import eagle.query.aggregate.raw.GroupbyKeyValue;
import eagle.query.aggregate.raw.GroupbyValue;
import eagle.query.aggregate.raw.WritableList;
import org.apache.hadoop.io.Writable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.Serializable;
import java.util.List;

/**
 * Aggregated writable result consist of group-by key-values list and additional meta information
 * 
 * <h2>Schema</h2>
 * <pre>
 * {
 *  keyValues: WritableList&lt;GroupbyKeyValue&gt;,
 *  startTimestamp: long,
 *  stopTimestamp: long
 * }
 * </pre>
 */
public class AggregateResult implements Writable, Serializable {

    private final static Logger LOG = LoggerFactory.getLogger(AggregateResult.class);

    /**
     * Automatically generated default serialVersionUID
     */
    private static final long serialVersionUID = 1L;

    private final WritableList<GroupbyKeyValue> keyValues;

    private long startTimestamp = 0;

    public long getStartTimestamp() {
        return startTimestamp;
    }

    public void setStartTimestamp(long startTimestamp) {
        this.startTimestamp = startTimestamp;
    }

    public long getStopTimestamp() {
        return stopTimestamp;
    }

    public void setStopTimestamp(long stopTimestamp) {
        this.stopTimestamp = stopTimestamp;
    }

    public WritableList<GroupbyKeyValue> getKeyValues() {
        return keyValues;
    }

    public void setKeyValues(List<GroupbyKeyValue> keyValues) {
        this.keyValues.addAll(keyValues);
    }

    private long stopTimestamp;

    public AggregateResult() {
        this.keyValues = new WritableList<GroupbyKeyValue>(GroupbyKeyValue.class);
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        this.startTimestamp = in.readLong();
        this.stopTimestamp = in.readLong();
        keyValues.readFields(in);
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeLong(this.startTimestamp);
        out.writeLong(this.stopTimestamp);
        keyValues.write(out);
    }

    public static AggregateResult build(List<String[]> keys, List<double[]> values, List<Integer> counts,
            long startTimestamp, long stopTimestamp) {
        if (keys.size() > values.size()) {
            throw new IllegalArgumentException(
                    "keys' size: " + keys.size() + " not equal with values' size: " + values.size());
        }
        AggregateResult result = new AggregateResult();
        result.setStartTimestamp(startTimestamp);
        result.setStopTimestamp(stopTimestamp);
        WritableList<GroupbyKeyValue> keyValues = new WritableList<GroupbyKeyValue>(GroupbyKeyValue.class,
                keys.size());

        for (int i = 0; i < keys.size(); i++) {
            String[] key = keys.get(i);
            GroupbyKey gkey = new GroupbyKey();
            for (String k : key) {
                gkey.addValue(k.getBytes());
            }
            GroupbyValue gvalue = new GroupbyValue();
            double[] value = values.get(i);
            for (double v : value) {
                gvalue.add(v);
                gvalue.addMeta(counts.get(i));
            }
            keyValues.add(new GroupbyKeyValue(gkey, gvalue));
        }
        result.setKeyValues(keyValues);
        return result;
    }
}